Open Session - SWISS GEOSCIENCE MEETINGs

REFERENCES
Brühwiler T., Goudemand N., Galfetti T. & Bucher H. 2007: Early Triassic ammonoid biostratigraphy and a new highresolution
carbon isotope record from Tulong area, South Tibet. 5th Swiss Geoscience Meeting, Geneva.
Galfetti T., Bucher H., Ovtcharova, M., Schaltegger U., Brayard A., Brühwiler T., Goudemand N., Weissert H., Hochuli P. A.,
Cordey F. & Guodun K., 2007a: Timing of the Early Triassic carbon cycle perturbations inferred from new U-Pb ages and
ammonoid biochronozones. Earth and Planetary Science Letters, 258, 593-604.
Galfetti T., Hochuli P.A., Brayard A., Bucher H., Weissert H. & Vigran O.V. 2007b: Smithian-Spathian boundary event:
Evidence for global climatic change in the wake of the end-Permian biotic crisis. Geology 35:291-294.
Orchard M.J., 2007: Conodont diversity and evolution through the latest Permian and Early Triassic upheavals,
Palaeogeography Palaeoclimatology Palaeoecology 252 (2007), 93-117.
Payne J.L., Lehrmann D.J., Wei J., Orchard M.J., Schrag D.P. & Knoll A.H., 2004: Large perturbations of the carbon cycle during
recovery from the end-Permian extinction, Science 305 (2004), 506–509.
3.8
New data on the Bouwxiller Formation (Eocene, Lutetian)
Lavoyer Thibault & Berger Jean-Pierre
Département de Géosciences, Géologie et Paléontologie, Université de Fribourg, chemin du musée 6, CH-1700 Fribourg
The old quarry in Bouxwiller is a historical outcrop studied since the beginning of the XIXe century (Cuvier 1812). It is located
in the village of Bouxwiller, in the western part of the North Middle Upper Rhine Graben in Alsace, France (Fig. 1).
Previous studies from the marls situated below and above the Bouxwiller limestone dated the deposit to the mammal zone
MP 13 (Jaeger 1971). This author postulates that the fauna of the two levels can be considered as homogeneous.
The outcroup consists of fossiliferous limestones and clays with a very small proportion of detrital elements.
All samples come from the “Ensemble supérieur” of the Bouxwiller formation, of the marly levels directly over- (coll. Lavoyer
2006-2007) and underlying (Collected by R. Isenmann during the eighties) the Bouxwiller limestone s.s. (Fig 2).
It has provided new fossils of several species, notably otoliths, mammal and reptilian teeth (crocodiles (with some serrated
teeth (pristichampsids)) and lizard), fragments of turtle shells, osteoderms, charophytes (with Maedleriella embergeri), gastropods
(Planorbis sp., Hydrobia sp., Melanopsis ?) and ostracods.
R. Isenmann has also provided access to his private collection, composed of reptilian and mammal teeth and bones. They
originate from the green marls, in the upper part of the limestone/clay alternation just under the Bouxwiller limestone
s.s.
The purpose of this work is to compare the various levels of the Bouxwiller Formation (biostratigraphy, paleoecology, taphonomy)
and to confront these new data with the existing literature to confirm (or not) the homogeneity of the Bouxwiller
fauna.
This study is a part of the PhD of T. Lavoyer and is financed by the SNF Project 200020-109457 and 200020-118025 “Paleontology
and Stratigraphy of the South Rhine graben during the Paleogene”.
We thank Mr Rodolphe Isenmann for providing access to his personnal collection.
12
Symposium 3: Palaeontology